322results about "Ether preparation by compound dehydration" patented technology

The invention relates to the technical field of methanol dimethyl ether fuel synthesis processes, in particular to a preparation method of a low-carbon biomass methanol dimethyl ether fuel. Biomass thermal cracking charcoal, tar, pyroligneous liquor and an additive are blended into neutral charcoal slurry according to a certain proportion, and then the neutral charcoal slurry is converted into the low-carbon biomass methanol dimethyl ether fuel. According to the biochar particles, a grading technology is adopted, namely, biochar with different particle sizes is mixed in proportion for pulping, so that the pulping concentration of biochar pulp can be effectively improved; according to the method, the pH of the wood vinegar is adjusted to be neutral, particulate matter in the solution is filtered out, and then pulping is conducted, so that the pulping concentration and the pulp quality can be effectively improved, and meanwhile pipeline blockage and nozzle abrasion are avoided.

A process for producing hydrocarbons, usable as fuels, from industrial, agroforestry, urban waste and derivatives thereof, with high sustainability and lower CO2 emissions, given the same energy, with respect to the equivalent fuels of fossil origin, by means of a series of subsequent conversions in which first a syngas is produced,, obtained by gasification of waste with oxygen at high temperature, which is purified and adjusted in composition by modulating the H2 / CO ratio and then converted into methanol. The methanol obtained is in turn catalytically converted into light olefins by means of methanol -to- propylene (MTP) technology; such olefins are catalytically converted by oligomerization in order to obtain a hydrocarbon mixture comprising an ultra-light fraction (C1 and C2 ), a light fraction (C3 and C4), a fraction with a boiling range from 60 to 300°C, and a fraction with a boiling temperature above 300°C to be used for product separation and fractionation treatments.

The invention relates to a high-selectivity continuous synthesis method of dipentaerythritol. According to the invention, pentaerythritol is introduced, so that more dipentaerythritol intermediates can be effectively generated at the initial stage of reaction, and the selectivity of dipentaerythritol is greatly improved. The reaction product solution can be separated through a conventional separation method, the separation cost is low, the obtained crude product pentaerythritol can serve as an additive to participate in the reaction again and be recycled, and high selectivity of dipentaerythritol is guaranteed. Besides, a continuous reactor is used for condensation reaction under the high-temperature condition, compared with a conventional method, the reaction rate is higher, the reaction time can be shortened to be within 1 hour, the selectivity of dipentaerythritol is improved, and the yield even reaches 30% or above.

A process for manufacturing methanol having a deuterium content of less than 90 ppm based on the total hydrogen content, the process comprising the steps of: (a) providing hydrogen having a deuterium content of less than 90 ppm based on the total hydrogen content by water electrolysis using power generated at least in part from non-fossil renewable resources; (b) providing carbon dioxide; (c) reacting hydrogen and carbon dioxide in the presence of a catalyst to form methanol.

The invention relates to a method for directly preparing (methyl) anisole from phenol and methanol, which comprises the following steps: under the action of a composite catalyst, phenol and methanol are catalyzed to generate methyl anisole, and the composite catalyst is prepared by mixing a Ho / beta molecular sieve catalyst and Ti / UiO-66 according to a mass ratio of Ho / beta: Ti / UiO-66 of 0.3-0.6: 1. According to the process, the reaction steps are simple, synthesis is achieved through one step, the total selectivity of methyl anisole reaches 76% or above, and continuous and stable operation can be conducted for 3000 h.

The invention provides a method for improving the selectivity of a product 3-methoxy-3-methyl-1-butanol (MMB). According to the method, the content of the isopentene methyl ether in the raw material isoprenol is controlled to be 0.005-0.25 wt%, so that the selectivity of the MMB can be effectively improved, the generation of key byproducts of isoprenol methyl ether and isoprenol methyl ether is reduced, and the purity of the MMB is improved.

A process for synthesis of dimethyl ether is proposed, in which a feed gas mixture (E) containing carbon dioxide and / or carbon monoxide and hydrogen is guided through reaction tubes (1) of a cooled shell and tube reactor (10) that are equipped with a first catalyst and a second catalyst, in which the carbon dioxide present in the feed gas mixture (E) and / or the carbon monoxide present in the feed gas mixture is at least partly reacted over the first catalyst with the hydrogen present in the feed gas mixture to give methanol, and in which, in the same shell and tube reactor (10), the methanol is at least partly converted over the second catalyst to dimethyl ether. It is envisaged that the reaction tubes (1) are equipped with the first and second catalysts in the form of a structured bed, where the structured bed has two to four regions (11, 12, 13) in which the first and second catalysts are provided in different physical mixtures, where the regions (11, 12, 13) are arranged such that the concentration of the first catalyst increases in a flow direction through the reaction tubes (1). Also proposed is a plant (100) for implementation of such a process.

The invention discloses a seawater electrolyzed water hydrogen production and energy cascade storage and utilization system which comprises an offshore steel frame platform. A seawater pump, a seawater purification device, a purified water storage tank, a water pump, an alkaline water electrolytic bath, a hydrogen purification and impurity removal device, a hydrogen storage tank, a hydrogen flow controller, a pyrolysis device, a gas purification and impurity removal device, a gaseous carbon dioxide storage tank, a carbon dioxide flow controller and a compressed carbon dioxide energy storage and heat exchange system are arranged on the offshore steel frame platform; the liquid carbon dioxide storage tank is arranged in the seabed below the offshore steel frame platform and connected with the compressed carbon dioxide energy storage and heat exchange system. Offshore wind power, photovoltaic energy and temperature difference energy are utilized for power generation, biomass is adopted for preparing seawater desalination wood and generating carbon dioxide, seawater is electrolyzed into hydrogen, the hydrogen and the carbon dioxide are synthesized and converted into green liquid fuel, and oxygen is used for supplying oxygen to an underwater system.

The invention provides a high-efficiency electric energy storage and zero-carbon emission technology for producing, storing and transporting dimethyl ether based on coupling of green hydrogen and a coal gasification process. Green hydrogen is prepared from renewable energy electrolyzed water and coupled with the coal gasification process to generate synthesis gas, then methanol is synthesized, and dimethyl ether is generated through dehydration. Dimethyl ether is stored in a liquid form and transported in a long distance, and is transported in a gas form during short-distance transportation. Efficient electric energy storage and zero carbon emission are achieved, and high economic and environmental benefits are achieved.

The present invention deals with a method of cross-etherification of at least one alkylated phenyl alcohol compound in a solvent free continuous process in the presence of at least one heterogeneous acid catalyst, preferably at least one cationic exchange resin, for preparing at least one alkylated ether phenyl compound.

The invention belongs to the technical field of organic synthesis, and relates to a preparation method of bis (trimethylolpropane), which comprises the following steps: preparing 2, 2-bis (hydroxymethyl) butyraldehyde from trimethylolpropane under the action of an oxidant; then, trimethylolpropane and 2, 2-bis (hydroxymethyl) butyraldehyde are subjected to reductive etherification under the action of a reductive etherifying agent and a catalyst, and the target product bis (trihydroxymethyl) propane is obtained. The preparation method of bis (trihydroxymethyl) propane has the advantages of few reaction steps and mild conditions, can improve the reaction yield, and is beneficial to the realization of industrial application.

The present invention relates to a process for producing dipentaerythritol from pentaerythritol in the presence of sulfolane and a heterogeneous polyacid catalyst supported on a carrier comprising a compound selected from the group consisting of: SnO2, mesoporous silica, and zeolite.

A method for producing a (poly)alkylene glycol monoalkyl ether includes reacting an olefin and a (poly)alkylene glycol in a reactor in a presence of a catalyst. The method also includes recovering at least a portion of raw materials used for the production to use the recovered raw materials again as a raw material, where at least one of the recovered raw materials contains an olefin. A mass of a branched olefin relative to a mass sum of the branched olefin and a linear olefin contained in the recovered raw materials is controlled not to exceed 20 mass %.

The present invention provides a method for producing a bio-derived branched alkyl glyceryl ether, the method comprising: a step for producing a bio-derived branched primary alcohol having a branched alkyl group having 6 to 12 carbon atoms, the step including dimerizing at least one component selected from the group consisting of a bio-derived linear primary alcohol having a linear alkyl group having 3 to 6 carbon atoms, a bio-derived linear primary alcohol having a linear alkenyl group having 3 to 6 carbon atoms, a bio-derived linear aldehyde having a linear alkyl group having 3 to 6 carbon atoms, and a bio-derived linear aldehyde having a linear alkenyl group having 3 to 6 carbon atoms; and a step for producing a bio-derived branched alkyl glyceryl ether using the bio-derived branched primary alcohol. The present invention also provides a bio-derived branched alkyl glyceryl ether produced by the method.

The present invention provides a process for producing C2-C4 olefins from methanol and ethanol, comprising: A) feeding a feed stream A containing methanol, with or without ethanol, to a dimethyl ether fixed-bed reactor to catalytically convert the methanol to dimethyl ether to obtain a product stream A1 containing dimethyl ether, methanol, ethanol, and water vapor; B) Stream A1 is mixed with at least one hydrocarbon recycle stream R containing C2-C6 hydrocarbons and treated in an olefin fixed bed reactor to produce C2-C4 olefins, C5-C6 hydrocarbons and C7 + catalytically converting the hydrocarbon-containing crude product stream B into a crude product stream B comprising hydrocarbons; C) cooling crude product stream B to obtain hydrocarbon crude product stream C; D) separating the hydrocarbon crude product stream C into a valuable product stream comprising propylene, optionally a valuable product stream comprising ethylene, a valuable product stream comprising butenes, at least one C5-C6 hydrocarbon-containing recycle stream, and a C6 + separating the hydrocarbon-containing by-product stream into at least one by-product stream; E) recycling a portion of the C2-C4 olefins and at least a portion of the C5-C6 hydrocarbons to step B) as one or more hydrocarbon recycle streams; F) obtaining a valuable product stream comprising propylene, a valuable product stream comprising ethylene, and optionally a valuable product stream comprising butenes; G)C6 + disposing of said by-product stream comprising hydrocarbons; Including, the methanol- and ethanol-based stream A contains less than 1% by weight or 30% to 50% by weight of ethanol, in which case 30% to 60% by weight of ethylene, 30% to 60% by weight of propylene and 0% to 30% by weight of butenes are obtained as valuable products, based on 100% by weight of C2-C4 olefins, and furthermore 0% to 40% of said ethylene, 40% to 90% of said propylene and 0% to 100% of said butenes, based on the C2-C4 olefins present in the crude product stream B, are recycled to step B); Alternatively, the methanol and ethanol based stream A comprises 1% to 30% by weight of ethanol, in which case 0% to 20% by weight of ethylene, 70% to 100% by weight of propylene and 1% to 20% by weight of butenes are obtained as valuable products, based on 100% by weight of C2-C4 olefins, and further 0% to 100% by weight of said ethylene, 0% to 20% by weight of said propylene and 40% to 100% by weight of said butenes, based on the C2-C4 olefins present in the crude product stream B, are recycled to step B).

The present invention refers to the chemical field, in particular to homogeneous organometallic catalysis in water-rich media, more particularly to the transformation of the pheromone 3-methyl-2-cyclohexen-1-ol in the presence or absence of [RuClCp(PTA)2] and [RuCp(H2O-κO)(PTA)2]CF3SO3

A use of a compound of formula Y: (Y) to form a protected nucleophile, wherein a single substituent selected from R1-R4 is -CH2-LG or -CH2-OH, wherein LG is a leaving group; at least one substituent s

The invention relates to a dapagliflozin impurity and a preparation method thereof, 5-bromo-2-chlorobenzoic acid (IV) is used as a raw material, (5-bromo-2-chlorphenyl) (4-ethyoxyl phenyl) ketone (III) is prepared through chlorination and Friedel-Crafts acylation, (5-bromo-2-chlorphenyl) (4-ethyoxyl phenyl) methanol (II) is obtained through reduction, and the benzhydryl ether impurity (I) is obtained through condensation under the catalysis of iodine. The preparation method has the advantages of simple operation, low cost, easily available raw materials and good product purity.

In order to overcome the problems of high recovery price, high energy consumption and low utilization rate of the existing kettle residue for the production of ethylene glycol by ethylene carbonate alcoholysis method, the application provides a kettle residue recovery method and device for the production of ethylene glycol by ethylene carbonate alcoholysis method, and the application provides a kettle residue recovery method for the production of ethylene glycol by ethylene carbonate, which comprises the following steps: under the conditions of temperature 150-250 DEG C and pressure 0.6-2 MPa, the ethylene glycol in the kettle residue produced by the preparation of ethylene glycol by ethylene carbonate alcoholysis method is converted into diethylene glycol under the catalysis of alkali metal salt catalyst, and after the reaction is completed, the kettle residue is a mixture of ethylene glycol, diethylene glycol, triethylene glycol and salt, the mixture is purified, and ethylene glycol and diethylene glycol are recovered; the economic benefit is improved, the rectification separation operation is simplified, the equipment investment and the overall energy consumption are reduced, and the utilization rate of ethylene glycol kettle residue is improved.

The invention relates to a process for the preparation of dimethyl ether, comprising the following steps:-introducing a methanol-containing stream (Sfeed-RD) into a reactive distillation apparatus (RD), in which-in at least one reaction zone (RZ) of the reactive distillation apparatus (RD), methanol is reacted in the presence of an acid catalyst to form dimethyl ether and water, and separating the stream by distillation into a fraction containing dimethyl ether and leaving the reactive distillation unit (RD) as an overhead stream (Soverhead-RD) and a fraction containing water and leaving the reactive distillation unit (RD) as a bottom stream (Sbottom-RD), withdrawing a methanol-containing side stream (Sside-RD) from the reactive distillation unit (RD), introducing the methanol-containing side stream (Sside-RD) into a side reactor (SR), and reacting the methanol in the presence of an acid catalyst to form dimethyl ether and water to obtain a product stream (Sproduct-SR) containing dimethyl ether, water and methanol and withdrawn from the side reactor (SR).

The device comprises an ethylene glycol storage tank (1), a nitrogen storage tank (2), a mixed gas storage tank (3), a high-pressure plunger pump (4), a preheater (7), a mass flow meter (8), a fixed bed reactor (9), a condenser (10), a phase splitter (11), a liquid collection tank (12), a gas chromatograph (14), a back pressure valve (16), a liquid chromatograph (17) and a plurality of valves. The ethylene glycol storage tank (1) is sequentially connected with the high-pressure plunger pump (4), the preheater (7), the fixed bed reactor (9), the condenser (10) and the phase splitter (11); and the nitrogen storage tank (2) is sequentially connected with a valve (5), the mass flow meter (8) and the preheater (7). By regulating and controlling the acidity and pore channel structure of the molecular sieve, efficient synthesis of the low polyethylene glycol is realized, and the problem of low product selectivity in similar catalysts is solved.

The invention relates to a catalyst for preparing anisole through phenol methanol etherification as well as a preparation method and application of the catalyst. The catalyst takes aluminum phosphate as a carrier and is doped with zirconium oxide; on the basis of the mole number of Al, the mole ratio of P to Al is (0.05-2): 1, and the mole ratio of Zr to Al is (0.08-0.20): 1. Dropwise adding the aluminum-zirconium mixed aqueous solution into the phosphorus source aqueous solution, stirring, standing and washing to obtain a solid sample; and drying and roasting the solid sample to obtain the aluminum phosphate catalyst. Under the action of the catalyst, phenol and methanol are catalyzed to generate anisole. Compared with the prior art, the phenol conversion rate is greater than or equal to 50%, the anisole selectivity is greater than or equal to 85%, highly toxic dimethyl sulfate and a large amount of alkali are not needed, the process is green, the cost is low, separation is simple, and the method is suitable for large-scale industrial production of anisole.

The invention discloses a preparation method of Linzagolix, which comprises the following steps: taking 2, 3-difluoro-6-methoxybenzyl alcohol as a raw material, under the action of alkali and phosphine ligand, carrying out Mitsunobu reaction on 2, 3-difluoro-6-methoxybenzyl alcohol and 2-methoxy-4-fluorophenol to obtain a compound A, sequentially carrying out nitration reaction and reduction reaction on the compound A to obtain a compound C, and carrying out recrystallization on the compound C to obtain the Linzagolix. Under the alkaline condition and the action of triphosgene, the compound C and 4-aminothiophene-2, 3-dimethyl dicarboxylate hydrochloride are subjected to a one-pot condensation reaction to obtain a compound D, and the compound D reacts under the alkaline condition to generate Linzaolix. According to the invention, the synthesis process of Linazagolix is shortened to five steps, the reaction condition is mild, the operation is simpler and more convenient, and the method is suitable for industrial production.

The invention relates to a method and a compound for preparing an orexin-2 receptor antagonist, and lebovolisan with less impurities, and particularly relates to a method and a compound for preparing an orexin-2 receptor antagonist. A process for preparing a compound of Formula (XI) and a compound are disclosed. Further, the present application discloses a compound of formula (XI) comprising a small amount of impurities. # imgabs0 #

The invention discloses preparation and application of a diethylene glycol etherification catalyst, and belongs to the technical field of organic synthesis. The catalyst disclosed by the invention is prepared by loading metal M into pores of an acidic molecular sieve and then roasting, the metal M is one or more than two of Fe, Co, Ni, Cu, Zn, Nb, Ag, Sn, W, Ga, Pd, Re, Y, La, Ce, Nd, In, Zr, Sm and Er, and the content of the metal M in the catalyst is 0.1-50 wt%; the catalyst is used in a reaction for catalyzing diethylene glycol and low-carbon alcohol to prepare diethylene glycol ether, the selectivity of the diethylene glycol ether is remarkably improved, and the catalyst is low in raw material cost, simple in preparation method, easy to industrially amplify and very good in application prospect.

To improve the recovery rate of alcohol, which is a constituent monomer of polyester resin, in a method for decomposing polyester resin using high-temperature water. [Solution] A method for decomposing polyester resin, comprising step (i) of hydrothermally treating polyester resin in the presence of polyamide resin, wherein step (i) includes proceeding with hydrolysis of the polyester resin at a temperature of 150°C or higher.

The invention relates to a method for producing dimethyl ether (DME). According to the invention, the first and the second reaction zone are arranged in a common synthesis reactor, in which the catalyst filling is arranged between two adjacent pillow plates and can be passed through by a respective input gas. A fluid cooling medium may pass through the pillow plate. The DME-containing product gas stream exiting the synthesis reactor is split into a DME end product stream, a gas by-product stream containing unconverted carbon oxides and hydrogen, a methanol by-product stream, and a wastewater stream. The gaseous by-product stream is sent at least partially back to the reactor influent to increase the overall achieved DME yield.

The present invention relates to a method for preparing 3-methylphenethyl ether, the method comprising the following steps: under the action of a catalyst, catalyzing m-methylphenol and ethanol to generate 3-methylphenethyl ether, wherein the catalyst is a silver-tin-zinc composite nitrogen silicon compound. The yield of the present invention is as high as more than 90%, and can be continuously and stably operated for 3000h. The process has high carbon atom utilization rate, adopts a continuous fixed bed process, has high reaction efficiency, does not need to use other solvents, and has low separation cost. And ethanol cost is low, and the overall process cost is greatly reduced. In addition, the reaction steps are simple, synthesis is achieved in one step, has good reactivity and selectivity, can achieve long-term stable operation, and is an ideal process for industrial production.

A process for dehydrating C2+ alcohols to ether products in the presence of a catalyst and promoter, wherein the catalyst is at least one aluminosilicate zeolite catalyst which is a medium pore zeolite having a 3-dimensional framework structure, and the promoter is one or more organic carbonyl compounds or derivatives thereof, and wherein and the molar ratio of promoter to C2+ alcohols is maintained at less than 1.